Peak power reduction and energy efficiency improvement with the superconducting flywheel energy storage in electric railway system

2013 ◽  
Vol 494 ◽  
pp. 246-249 ◽  
Author(s):  
Hansang Lee ◽  
Seungmin Jung ◽  
Yoonsung Cho ◽  
Donghee Yoon ◽  
Gilsoo Jang
Keyword(s):  
Energy Efficiency ◽  
Energy Storage ◽  
Peak Power ◽  
Power Reduction ◽  
Efficiency Improvement ◽  
Flywheel Energy Storage ◽  
Energy Efficiency Improvement ◽  
Peak Power Reduction ◽  
Railway System ◽  
Electric Railway

scholarly journals Energy-Efficiency Analysis of Per-Subcarrier Antenna Selection with Peak-Power Reduction in MIMO-OFDM Wireless Systems

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Ngoc Phuc Le ◽  
Le Chung Tran ◽  
Farzad Safaei
Keyword(s):  
Energy Efficiency ◽  
Power Efficiency ◽  
Peak Power ◽  
Antenna Selection ◽  
Average Power ◽  
Wireless Systems ◽  
Power Reduction ◽  
Cumulative Distribution ◽  
Peak Power Reduction ◽  
Mimo Ofdm

The use of per-subcarrier antenna subset selection in OFDM wireless systems offers higher system capacity and/or improved link reliability. However, the implementation of the conventional per-subcarrier selection scheme may result in significant fluctuations of the average power and peak power across antennas, which affects the potential benefits of the system. In this paper, power efficiency of high-power amplifiers and energy efficiency in per-subcarrier antenna selection MIMO-OFDM systems are investigated. To deliver the maximum overall power efficiency, we propose a two-step strategy for data-subcarrier allocation. This strategy consists of an equal allocation of data subcarriers based on linear optimization and peak-power reduction via cross-antenna permutations. For analysis, we derive the CCDF (complementary cumulative distribution function) of the power efficiency as well as the analytical expressions of the average power efficiency. It is proved from the power-efficiency perspective that the proposed allocation scheme outperforms the conventional scheme. We also show that the improvement in the power efficiency translates into an improved capacity and, in turn, increases energy efficiency of the proposed system. Simulation results are provided to validate our analyses.

scholarly journals Dynamical behavior and peak power reduction in a pair of energy storage oscillators coupled by delayed power price

2016 ◽  
Vol 93 (2) ◽  
Author(s):  
Tomohiro Fukunaga ◽  
Tomoaki Imasaka ◽  
Akira Ito ◽  
Yoshiki Sugitani ◽  
Keiji Konishi ◽  
...  
Keyword(s):  
Energy Storage ◽  
Peak Power ◽  
Dynamical Behavior ◽  
Power Reduction ◽  
Peak Power Reduction

scholarly journals Fault-Tolerant Control in a Peak-Power Reduction System of a Traction Substation with Multi-String Battery Energy Storage System

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4565
Author(s):  
Marcin Szott ◽  
Marcin Jarnut ◽  
Jacek Kaniewski ◽  
Łukasz Pilimon ◽  
Szymon Wermiński
Keyword(s):  
Energy Storage ◽  
Peak Power ◽  
Fault Tolerant ◽  
Storage System ◽  
Energy Storage System ◽  
Power Reduction ◽  
Battery Energy Storage System ◽  
Battery Energy Storage ◽  
Traction Substation ◽  
Battery Energy

This paper introduces the concept of fault-tolerant control (FTC) of a multi-string battery energy storage system (BESS) in the dynamic reduction system of a traction substation load (DROPT). The major task of such a system is to reduce the maximum demand for contracted peak power, averaged for 15 min. The proposed concept, based on a multi-task control algorithm, takes into account: a three-threshold power limitation of the traction substation, two-level reduction of available power of a BESS and a multi-string structure of a BESS. It ensures the continuity of the maximum peak power demand at the contracted level even in the case of damage or disconnection of at least one chain of cells of the battery energy storage (BES) or at least one converter of the power conversion system (PCS). The proposed control strategy has been tested in a model of the system for dynamic reduction of traction substation load with a rated power of 5.5 MW. Two different BESS implementations have been proposed and several possible cases of failure of operations have been investigated. The simulation results have shown that the implementation of a multi-string BESS and an appropriate control algorithm (FTC) may allow for maintenance of the major assumption of DROPT, which is demanded power reduction (from 3.1 MW to 0.75 MW), even with a reduction of the BESS available power by at least 25% and more in the even in fault cases.

Energy efficiency improvement and GHG abatement in the global production of primary aluminium

2014 ◽  
Vol 8 (4) ◽  
pp. 629-666 ◽  
Author(s):  
Katerina Kermeli ◽  
Peter-Hans ter Weer ◽  
Wina Crijns-Graus ◽  
Ernst Worrell
Keyword(s):  
Energy Efficiency ◽  
Efficiency Improvement ◽  
Energy Efficiency Improvement ◽  
Primary Aluminium
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